help, I keep busting my rear end

[btmatt]

I hate my tuner.. after tuning my HCIE LS3, I have broken my diff twice in the last week. Here is what I got:

1. 1967 PT Camaro, 500RWHP NA LS3, Tremec Magnum 6 speed (2.97 1st gear)
2. PEM 9" ford housing, 31 spline axles, detroit locker, 3.89 gears
3. Nitto NT05 rear tire; ~12" wide, 26" tall.

First time out, we broke the case and destroyed 1310 ujoint; Ford grey iron case and pinion support. No biggie, I always figured that would have been the weak link.



We then rebuilt/upgraded the case to Strange Nodular 3.06 case, Daytona Pinion Support, new gears, bearings etc. and proceeded to snap/shatter the drivers side rear axle at the spline transition. This was at the drags, during launch, on street tires.

I know that there are others on here with wayyy nastier combos than mine that are holding together. Let me know what you are using